param(
    [string]$Repository = (Resolve-Path (Join-Path $PSScriptRoot '..\..\..\..\..')).Path,
    [string]$Output = (Join-Path $PSScriptRoot '..\generated\firmware_build_id.h')
)

$id = 'NOGIT000'
$hash = (& git -C $Repository rev-parse --short=8 HEAD 2>$null)
if ($LASTEXITCODE -eq 0 -and $hash) {
    & git -C $Repository diff --quiet HEAD 2>$null
    $id = if ($LASTEXITCODE -eq 0) { $hash.Substring(0, 8) } else { $hash.Substring(0, 7) + '+' }
}
$directory = Split-Path -Parent $Output
New-Item -ItemType Directory -Force -Path $directory | Out-Null
$body = "#ifndef FIRMWARE_BUILD_ID_H`n#define FIRMWARE_BUILD_ID_H`n#define FIRMWARE_BUILD_ID `"$id`"`n#endif`n"
if (!(Test-Path -LiteralPath $Output) -or ((Get-Content -Raw $Output) -ne $body)) {
    [IO.File]::WriteAllText($Output, $body, [Text.UTF8Encoding]::new($false))
}
Write-Host "[firmware-info] build-id: $id"